crowell



E. 'V. CROWELL.

PLUG.

APPLICATION FILED MAY 22. 1922.

Reissued Dec. 5, 1922'.

uwmvron E. 7. Croat/ell,

Agra/runs WITNESSES Reissued Dec. 5, 1922.

um reo STATES PAT NT)OFFICE,

nan. v; CROWELL, or TULSA, OKLAHOMA, ASSIGNOR, 'BY MESNE AssIGNMENTs, or

ONE-HALF TO HE GUIIBERSON CORPORATION, A coRroRA'rIoN -or DELAWARE;

. anima n 1, Q4305 ewe Teall whom it may cencem: Be it known that lgfEeply; CBo EhL-r a citizen of the United States; and a resident flu em n: the eun y ref ulsa. endls et Qt Qklehem h e invented! e r einl n' e genow eg I My inyenuqp is, an i ovem n ll fplllg .vulre.

I As is known,'v.vhen water underliesoil andin: the same sand, with no impervious strata 'to separate thewater beeringpart of the' :send from the productive part of the sand,

Water will interfere ,With the producf.. ..d new lmplfevemente'inl hge, of hi a ep ifi' etien end. has. 0. 7 s bieet he pr vi e 1 de i 10 f he. her e ipeei ed pe ie ly e ep for providin I .tom 'of .a wel bore forthe purpose of shutting ofl a flow of Water from below, wherein e the ar ang m n i ch ha th p ug my .le' he'intre l ee thr gh he e l ea ing n exmi ed at v he d sir po nt b levj eeing teseel he e here t hi p lnt. I t, fitln'thed' e in 1 Figur 1 s a en ew f the mpro exp n ed. ndit n 3! -pe ts n cent ee ed. pe ien; figure 3- e t p p e e of he. pl g; F gure 4 is a section on the line of F g-' Flgure 5 1s a d1agrannnat1cv1ew show ng? --the,fmenner of arranging the reinforelng tion of the oil sand by flooding the sand with waterfrom below. Iweteris genrally' under e h gh pr ss re d he gr resive powe 111 nenihg e mi t lig e,

exual :emennt e Water willwbe r pl i- *emded te admit mere Water end, hefl will heeenle gradually lees il per entege e e l and greater pereent ge 9t ete T water, having the greatest erosive force, will fight for and Win, 'first place at the eutlet 'peey ded by th el In order to pro erly seal the to shut off this objectione le flow onfvvate'r the bore of the we us b filled o ple ely, h a s b t n iel pl g f Plas c m t r 'l ap Y b1 01f herde ng; held e tiegeiest the' l ,7 closely filledif Y r r v I In the present embodiment of the inven I t m e o 1. s p e d yofs eeller e h suitable materiel, and upon ,echndiOfthis a Water-tight seal at the -botp figure; 2 s a rt e l e tlen th t of the Well nnderi h'eavy lateral, pressure, so

' thet the pore spaces and variations in diameter. of the latterdWi-ll be thorough1y e'nd core. is arranged a sleeve 2 and 3,'.re'spectlvely. The sleeve2 hats/a flange 4;.- at' its lowerend andthe sleeve 3 is: S e l-1 and shell are externally threaded andeech is engegedby a washenfi andi, respectively. The core is slidable throughthe sleeve3 and enkzir by t, The upper ends oi-the lower sleeve a transverse partition8"isprovided et the,

lower; end of the sleeve for holding the core froln'movernent downward through the sleeve until pressureis brought upon the core to drive it through the partition;

to be engaged by the inwardly exten' ing ends o f resilient dogs 10'secured to the shell 5, and. extending through registering open.-

ings in the 'shell and sleev to eng 'age the grooves of the core, 7 Referring to Figure" 1,

,it will be noted the-t these grooves have up tw r ly a i g h l ers, th upp r Wells of. the grooves beingincl'ined'topermit the dogs; to slip smoothly ovelrfsaid walls,

The sleeve 2 constitutes a heed for driving thejcore-'thr0ugh the sleeve 3, and the core has annular grooves 9, which are 'ada ted piral vanes 11 1 are arran ged betiveen the flange l and the asher G eachfVane being of a l'ength to extend from the fienge4to the w ieh 'fi w en hev engeend he resel er. are separated to the desiredfdegree. These z eees ere enneete at hei he. o. t v fl ng en t th weshers fi nd? b he and nuts 11 ens/ 1 1%.. .reepeetively; e si intermediate portions" of the vanes ere'free,

t veeee being eenieee ed e1 theie n y It i ous tha wh n the fl hgeieme ewerd the w he s 4.61 e 17 h'ef,.PitQ of the v ne Will b es ne nd the "egg gate width from the outer edges of the vanes tothe center or axis of the" eore'lwi'll" be increased. Thus the outer edges of the vanes h c e arp ne e eee' sedt bite i the wall of the well end to make lateral pressure toward the saidwalls, digging themselves in and gripping positively" I the walls of the well.

productive oil strata separatedifrom the oil 1 In use, the plug arranged as shown in igure 1 is lowered into the well, and when in as the core moves .through the sleeve 3 the dogs engage the grooves 9 and prevent reverse movement 0 thecore. The vanes grip the well wallfa nd after the device is n proper position cement or other "packing may beintroduced, as much being added as may be. desired. j In practice, 'whilejlowerthe packing material it is advisable to mix-ordinary fuel oil' with'the cement."

I I It will be understood that thefevent thereis a water bearing stratum below the "stl'atalby' animpervious stratum, and the v impervious stratum should be penetrated-by .In order to provide a meansfor holding the drill, abottomholeplug would be necessary to prevent the water from invadin the oil sand. It will be noticed that both en s of "the shell 5 arethreaded, the lower end for the anchor'pipe. This-anchor pipe, indicated atjl3,jinj ractice not only acts to properly position 't e p1ug',""but, being embedded in the cement serves to anchor the "plug. In the usual practice,the plugwillbe loaded with ai'cement or packingmaterial placed in betweenjthefspirals before it'is lowered, althou'ghit is obvious that this may be done afterward. A better result is obtained by lowering the packing withthe plug.

'a sealing medium in the spiral vanes, a number of openings 14 are provlded in the edges of the spirals which serve as an anchorage for the sealin medium',.and ,throughwhich wires lemay elrun if desired, to better anchor the sealing medium, as shown in Figure '5. The preferred form of sealing means is oakum saturated with thin cement mixture, 7

" wrung outabout half dry a'nd then tiedjin the spiral vane. The plug; after being loads ed withthesealing mixture and'attached to the anchor pipe ofproper length, constitutes a complete plug in one direction, glvlnglt the power to automatically and properly p0 sition itself in the well and to seal or plug thehole at the desired point.

I'claimg- 1 y e 1. A device of the character specified com prising acore, a head at oneend of the core, a sleeve at theother end through which the core is adapted to move, said core and sleeve.

having interengaging means for preventing reversemovementof the core with respect to the sleeve, a series of vanes extending between the sleeve and the head spirally of the core and connected at their ends to the head and the sleeve to be expanded when thehead and to'bite'into the wall of a well opening Y sion, frangible means for normally preventdogs on the sleeve and teeth on the core for "ment.

" the "sleeve, a series of *vanes extending be,-

between thesleeve and the head spirallyo it headismoved toward the sleeve and to" bite into the wall of pansion.

head, a sleeve atthe otherend through which is moved toward the sleeveand to bite into the wall of a well opening upon such expaning downward movement of the core with respect to the sleeve, the lnterengaging means between the sleeve and the core comprising engagement by the dogs to prevent upward movement of thexcore with respect to the sleeve and to permit free downward move- 2. A device of the character specified comprising a core, a head atonement the core, a sleex e'at the'other end through which the core is adapted to move, said coreqand sleeve having interenga'gingfmeans for preventing reverse movement of the core with respect, to

tween the sleeve andithe head spirallvofthe core and connected at theirend's to the head and the sleeve to be expandedwhen the head is moved toward thes'leeve and biteinto thewall of awell opening upon suchex'pansion, and frangible means for normally pref venting downward movement of the core with respect to the sleeve. h I

' 3. A device ofhe ch 'rac'ter specified comprising a core,'a'head atone end of the core, a sleeve atthe other en'dthrough which the "core is adapted to move, 'said'core and'sleeve having intere'ngaging means .for preventing reverse movement of the core with respect-to the sleeve, a series of vanesextending between the sleeve and the head spirally of the core and connected at theirends to'th'e head and the sheeve to be expanded when the head is moved toward-the sleeve and to-bitel into I the wall of a well opening upon such expansion,'the interengaging means between the sleeve and the core comprising dogs onthe sleeve and teeth on the core for engagement 1 by the dogs to prevent upward movementof the core with respect to thesleeve and-to'permit free downward movement. Y n

4. "A devicefofthe character specified comprising acore, ahead at 'one end of the core, a sleeve at the other endfthrough which the core is'adap'ted to move, said core and sleeve havlng interengaglngf means for" preventlng reverse movement of the core with respect to the sleeve, and "a-ser1es of vanes extendin the core and connected at their endsfto the head and the sleeveto be. expanded when the a well opening upon such ex- 5 A device of the character specified comprising a core. provided at one end with a the core'is movable, spirally arranged vanes extending between the sleeve and the head about the coreandj adapted to be expanded when the sleeve and head are moved together upon such expansion, and frangible means about the core and adapted to be expanded for normally preventing movement of the when the sleeve and head are moved together 10 sleeve toward the head. and to bite into the wall of a well opening 6. A device of the character specified comupon such expansion, and means for prevent- 5 prising a eoreprovided at one end with-a ing reverse movement of the sleeve with rehead, a sleeve at the other end through which spect to the head. the core is movable, spirally arranged vanes extending between the sleeve and the head ERD. V CROWELL. 

